Preheat oven to 375 degrees. Cream together margarine and sugar. Add baking powder, eggs, yolk and creamer. Mix well. Beat in cocoa and flour. Stir in chocolate chips and nuts, if using. Divide dough in half and shape into logs. Place on lightly greased cookie sheet. Combine egg white and water and brush on top of logs. Sprinkle with sugar. Bake for about 25 minutes and cool slightly. Slice and return to oven for about 10 minutes. Cool on wire rack.

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